Dust collector mechanism



Sept. l, 1931. w. B. PRouTY 1,821,665

DUST COLLECTOR MEcHANIsu Filed Dec. 7, 1925 2 Sheets-Sheet 1 Sept. l,1931. w. B. PRouTY DUST COLLECTOR MECHANISM Filed Dec. 7. 1925 2Sheets-Sheet 2 0 w s 0 r v/ @l h P m m I. I Il rJl Il Il .0. BM 4 r m maw M M 7/ mo M a n, U u M ,w n 4 ...w n f Lil lili n m y -L m l. .Il i i.w l xk 2 y f Patented Sept. l, 1931 WILLIAM .'B. PROUTY, OF EVANSTON,ILLINOIS DUST COLLECTOR MECHANISM Application led December 7, 1925.Serial No. 73,582.

, This invention relates in general to a system for grinding orpulverizing and col.- lecting the properly ground material and moreparticularly to the dust collecting 3 mechanism thereof.

One of the objects of the invention is the provision of a new andimproved dust collector with new and improved means for introducing theair thereto and removing the same therefrom. 3

Another Aobject ofthe invention is the provision of new and improvedmeans for ventin the collector for relieving the pressure t erein with aminimum loss of 16 material.

A further object of the invention is the provision of a novel collectorwith new and improved means Yfor causing the air delivered to'the sameto rotate about the vertical axis of -th'e collector during' theoperation of the system. E

A still further object of the invention is the provision of a. new andimproved collector ,that is. cheap to manufacture, easily assembled andinstalled, eicient in operation, exceedingly simple in construction, andthat is not likely to become deranged or get out of order. l

Other and further objects and advanta es so of the invention will appearfrom the ollowing description taken in connection with the accompanyingdrawings, in which Fig. 1 is an elevation of aportion of a buildingshowing the invention in osition x5 therein, with parts in section anbroken away; l

F ig.` 2 is a side elevation ofthe collector on an enlarged scale, withparts broken away;

Fig. 3 is a plan view thereof;

Fig. 4 is a section on line 4 4- of Fig. 1, shown more orlessdiagrammatically and looking in the direction of the arrows; and

Fig. 5 is a side elevation of a separator .6 showing a modified -form ofmeans for supplying air thereto. y On the drawings the referencecharacter 10 designates a building comprising the lower floor 11, theroof 12,"and the iloors or supports 13 andl4.

parts The invention is shown as being employed in a system in which asingle separator and a single collector are employed, but it isunderstood that this disclosure is by way of example only, as thearrangementl may beA otherwise.

As shown, the system comprises a mill 15 for grinding the material, anair conveyor 16, a dust separator 20 for separating the coarser materialor rejects and returning them to the mill to be reground, a fan 17 foroperating the system, a transfer conduit 19, a dust collector 21 forremoving the ground material from the air, and a return pipe or airconduit 22 for delivering 65 the air from the collector into the airconveyor 16. The mill 15 for grinding or pulverizing the raw materialdelivered thereto may be of any approved construction. The same `isoperated by any convenientv means as thev motor 23. The raw material issupplied to the mill by a conduit 24 from any suitable source of supply,as is usual in such constructions. The ground material is delivered intothe lower portion of the pipe or conveyor 16 and is elevated to theseparator 20 through said conduit by an air current induced by thesuction of the fan 17.

The air conveyor 16 is provided at its so lower end with a gravity valve25 normally held in closed position b a weight26 adjustable along an arm2 rigidly mounted on the gravity valve 25. r1 he valve is adapted to beo ened by the wei ht of materlal that may, or any reason, coect in theipe or conveyor 16 during the operation oy the system. The valve 25 ispivoted at its upper Y edge as at 28. The sides of the pipe are extendedat each side of the valve as at 31 90 for preventing the entrance of airwhen the valve is opened fordischarging the material accumulated in thepipe 16.

The separator 20 1s provided with a ipe fitting 32 to which the pipe 16is attac ed. 95 The fitting 32 is` so arranged that the air enteringthrough the same 1s delivered tan gentally into the interior of theseparator.

The'separator 20 is preferably of the t shown in`my copendingapplication S.

73,581 filed December 7, 1925, and comprises an upper section 33preferably though not necessarily circular in cross-section, and a lowerconical Section 34. As shown, the upper section -is cylindrical. Thecylindrical portion is provided with a closure 35 through which extendsa pipe 36. The inner end of the pipe 36 extends axially of the separator2O and terminates adjacent to the plane dividin the upper and lowersections, as indicate in dotted lines in Fig. 1. The pipe 36 is providedwith a valve or blast gate 37 for controlling the flow of air throughthe pipe 36.

The stream of air carrying the ground material enters the separatortangentially and circulates or revolves about the pipe 36 whereby theground material is, by centrifugal force, thrown outward against theinterior of the separator, the air and finer material escaping from thecenter of the revolving mass through 4the pipe 36 into the fan 17. Thecoarser materlal gravitates to the bottom of the cone and `escapesthrough the opening 38.

The separator thus far described is similar, if not identical with theconventional dust collector except that it is not provided with agravity valve at the discharge opening 38.

It has been found by experiment that if `air be admitted at the bottomof the conical section 34 the properly ground material may be carriedover by the fan into the collector 21. Suitable means are provided foradmitting air to the bottom of the separator. As shown, a casing 30having the same general shape as the members 33 and 34 is attached tothe lower end of the conical member 34. This casing comprises acylindrical portion 360 and a conical section 370. The parts are soarranged that the opening 38 is on the axis of the casing and isadjacent to the plane dividing the upper and lower sections of thecasing 30.

One or more inlet fittings 39 are provided in the cylindrical portion360. These fittings are so arranged that air will enter the casing 30tangentially and will revolve about the lower end of the conical section34 in the same manner and in the same direction as the air in thecylindrical section 33. The revolving air will pass upward through theopening 38'and will cooperate with the air in the separator proper toseparate the properly ground from the coarser material. The properlyground material is removed through the pipe 36 and the coarser materialis returned to the mill through a suitable valvc 40. The inlet fittings39 are provided with valves or blast gates 41 for controlling the amountof air admitted. The more air admitted to the casing through the inletfittings 39 the more material will be Carried over into the collector,so by regulating these valves the desired fineness of the groundmaterial may be obtained. The coarser material gravitates to the bottomof the casing 30 and is discharged by gravity through the valve l intothe mill 15 to be reground. If desired, a central conduit 42 may beprovided for supplying air to the central lower portion of the conicalsection. The conduit 42 is provided with a valve or blast gate 43 foropening and closing said conduit.

From the separator the air and ground material -is drawn into the fanwhich forces the same through the conduit or pipe 19 into the collector21. The fan is operated by any suitable means, as the motor 44.

In the form of the device selected to illustrate one embodiment of theinvention, the collector 21 comprises a casing havin an upper section 45which is preferably though .not necessarily cylindrical, and alower'conical section 46.

The upper section 45 is provided with a partition 47 which is preferablyin the form of a funnel, that is, it is conical with a dependingcylindrical projection 48 which extends adjacent to the plane of themeeting portions of the two sections of the collector.

The upper section 45 has a closure 49 through Awhich extends a breatherpipe 52. The pipe 52 extends axially into said cylindrical portion bothabove and below said closure 49 and is provided with a lower section orextension 53 telescopically mounted on the lower end of the same andheld in adjusted position by any suitable means as the rods rigidlyconnected .to said extension and held in adjusted position by the nuts54 threaded on said rods and engaging the upper suface of said closure.

If desired, a deflector 55 may be suspended beneath the lower end of thesection 53. Preferably the deflect( is in the form of an inverted coneand i held in spaced relation to the section 53 by the straps 56. Theapex of the cone is preferably removed whereby any material that maycollect in the cone may escape through the opening formed therein.

The inlet fitting 57 for the pipe or conduit 19 is attached to thecylindrical section of the collector below the partition and deliversthe air into said section tangentially thereof, whereby the air willrevolve about the cylindrical portion of the partition, therebyseparating the ground material by centrifugal force. The material willgravitate to the bottom of the cone section 46 and will be dischargedthrough the gravity valve 58 into a suitable receptacle inthe usualmanner. The gravity valve 58 is normally held in closed position by theweight 59 adjustably mounted on the arm 61 rigidly connected to thevalve 58. The arrangement is substantially the same as the valve 25 atthe lower end of the conduit 16.

The outlet fitting 62 for the pipe 22 is at tached above the partitionand is so arranged that the air leaves the cylindrical portiontangentially thereof. The two littings are so arranged that the airabove the partition is caused to revolve about the lower end of thebreather pipe in the same direction as the air below the partitionwhereby the material escaping with the air into the upper section willbe thrown outwardly. Since the breather pipe extends down into the axisor vortex of the revolving body of air, the air escaping through saidpipe will be substantially free of dust. This is considered an importantfeature of the invention since it insures a minimum loss of materialthrough the breather pipe and eliminates the objectionable pollution ofthe air in the vicinity of the buildin The material in the lower sectionof the co lector will gravitate to the bottom of the cone 46 and will bedischarged through the gravity valve 58 into a suitable receptacle 63.

The upper end 52 of the breather pipe 5l may be provided with the usualWeather cap 64 and may, if desired, be provided with a valve 65 forcontrolling the size of the opening in said pipe. The valve 65 isadapted to be operated in any suitable manner by the arm 66.

The air escaping from the collector through the fitting 62 is conductedby the pipe 22 back to the air conduit 16. If desired a'valve 66 may beprovided in the lower portion of the pipe 22. This valve may be held inclosed position by a weight 71 adjustable along the arm 72 on the valveor by a light spring.

It is desirable that the parts be so constructed that the air in thepipe 22 will not be under compression at this point. If the a1r escapesthrough the valve 66 it will indicate that the air is under pressure atthis point and the operator, being apprised of this condition mayproperly regulate one or more of the other valves of the system tocorrect the difficulty.

In the form of the device shown in Fig. 5, the air supplied to thecasing 30 may be obtained from the pipe 22. The pipe 22 is provided witha fitting 67 to which the pipe 68 and the pipes 69 are connected. Thepipe 68 is attached to the inlet or central conduit 42 and the two pipes69- are attached to the inlet fittings 39.

It is thought from the foregoing taken in connection with theaccompanying drawings that the construction and operation of my devicewill be apparent to those skilled in the art, and that various changesin size, shape, proportion and details ofgconstruction may be madewithout departing from the spirit and scope of the appended claims.

l claim as my invention:

1. In combination, a collector comprising an upper section, a lowercone-shaped section, an extensible breather pipe extending down intosaid upper section, an inlet and an outlet fitting'tangentially securedto said upper section, said fittings being arranged to cause the air torevolve about said breather pipe, a valve in said pipe, and means forvarying the length of said pipe.

2. A dust collector comprising a casing having an upper section circularin cross-section, a lower conical section, a partition having a centralopening in said upper section, an inlet fitting for directing airtangentially into said upper section below said partition, an outletfitting for permitting the escape of dust from said lower section, abreather pipe extending down into said upper section along the axisthereof and having an adjustable lower section, and a valve in saidbreather pipe for controlling the size of the passage therethrough.

3. A dust collector comprising a casing having an upper section providedwith a partition having a central depressed portion, said depressedportion being provided with a depending cylindrical member, a coneshapedlower section, a breather pipe extending axially into said casing andbeing provided with a telescopic extension, an inverted cone-shaped capcarried by said extension and extending into said depressed portion, andmeans for delivering air into said casing below said partition and meansfor conducting air from said casing from above said partition.

4. A dust collector, comprising a casing having an upper section and alower conical section, a partition in said upper section, meansassociated with said casing for causing the air above and below saidpartition to revolve about the longitudinal axis of said casing in thesame direction, and a breather pipe extending into the axis of therevolving mass of air, said breather pipe comprising upper and lowertelescopic sections of substantially the same internal diameter, meansfor holding said sections in adjusted position, and a deflector membersuspended from the lower section and movable therewith.

5. A dust collector comprising a casing having an upper cylindricalportion and a lower conical portion, means for conducting air into theupper portion of said casing and causingy the same to revolve about theaxis thereof, means for conducting the air from the upper portion ofsaid casing, an air discharge pipe having one end extending axially intosaid casing, said discharge pipe comprising an upper fixed section, a

lower movable section of substantially the same diameter telescopingsaid upper section, means for holding said lower section in adjustedposition on said upper section, and a deilector member secured to saidlower section and extending below the same.

6. .A dust collector, comprising a casing having an upper cylindricalsection and a lower conical section, means for introducing air into saidcasing, means for conducting air from said casing, a breather pi eextending axially downwardly into said casing, said pipe comprisingtelescopic sections of substantially the same dlameter, and a valve insaid pipe for controlling the escape of air therethrough.

7. A dust collector comprising a casing having an upper cylindricalsection of uniform diameter throughout its length and a lower conicalsection attached thereto, a partition for said upper section, a breatherpipe extending into said upper section, a conduit for delivering air andground material tangentially to said casing below said partition forcausing the air to rotate in one direction in said casing, and a conduitfor permitting the escape of air tangentially from the casing above saidpartition in a direction to cause said air to continue to rotate in thesame direction within said casing, said breather pipe comprisingtelescopic sections and means for holding said sections in adjustedpositions.

8. A dust collector comprising a casing having a cylindrical upperportion of uniform diameter throughout its height and a cone-shapedlower portion, a funnel-shaped partition in said cylindrical portion, abreather pipe extending axially into the upper end of said casing andinto the funnel formed by said partition, an air inlet below saidpartition, an air outlet above said partition, and an invertedcone-shaped defiector supported beneath said breather pipe.

9. A dust collector, comprising a casing having an upper cylindricalsection and a lower conical section, a partition in said upper section,an`d means associated with said casing for causing the air above andbelow said partition to revolve in the same direction about thelongitudinal axis of said casing, an extensible breather pipe extendingdownward into said casing, and a valve in said pipe.

10. A dust collector comprising an upper cylindrical section of uniformdiameter throughout its height, a lower conical section, a partition insaid upper section, said partition being provided with a dependingapertured portion, a telescopic breather pipe extending down into saidupper section, a tangentiall arranged air inlet below said partition orconducting air into said upper section and causing the same to revolveabout the lower end of said breather pipe, and a tangential outletfitting above said partition,

In testimony whereof I alix my signature.

WILLIAM B. PROUTY.

